FTA and FMEA Class Fault tree analysis (FTA) is a top-down deductive failure analysis technique that uses Boolean logic to analyze an undesired system state. FTA was originally developed in 1962 by Bell Laboratories to evaluate failure in missile launch control systems. FMEA is a structured approach to discovering potential failures early in product or process design. FMEA was developed by the US Military in the 1940s to reduce variation and potential failures in munitions production. Key aspects of FMEA include identifying failure modes, assigning severity, occurrence, and detection ratings, and calculating a risk priority number to determine the criticality of failures.

1. FTA & FMEA Class
WorkSubmitted by
Ojes Sai Pogiri
K-5870

2. FTA
• Fault tree analysis (FTA) is a top-down, deductive failure analysis in which an undesired state of a
system is analyzed using Boolean logic to combine a series of lower-level events.
• FTA is used in the aerospace, nuclear power, chemical an process, pharmaceutical petrochemical and
other high-hazard industries; but is also used in fields as diverse as risk factor identification relating
to social service system failure.
• In aerospace, the more general term "system failure condition" is used for the "undesired state" / top
event of the fault tree.
• Fault tree analysis (FTA) was originally developed in 1962 at Bell Laboratories by H.A. Watson, under
a US air force Ballistics Systems Division contract to evaluate the Minutemal Intercontinental Ballistic
Missie (ICBM) Launch Control System.
• Event symbols are used for primary events and intermediate events. Primary events are not further
developed on the fault tree. Intermediate events are found at the output of a gate
• Gate symbols describe the relationship between input and output events

3. FMEA
• Failure Mode and Effects Analysis (FMEA) is a structured approach to discovering potential failures that
may exist within the design of a product or process
• FMEA is one of many tools used to discover failure at its earliest possible point in product or process
design. Discovering a failure early in Product Development (PD) using FMEA
• US Military at the end of the 1940s developed the technique to reduce sources of variation and
corresponding potential failures in the production of munitions – and it proved a highly effective tool
• By performing FMEA we have Design and Development ,Operations and Cost Benefits
• Types of FMEA:- Design , Process and System FMEA
• Steps in the FMEA
• Detecting the failure mode
• Finding Severity number (SEV), all the number are ranked from 1 to 10
• Probability of occurrence (occur)
• Detection number (DETEC)
• Risk Priority Number (SEV*Occur*DETEC) the smaller number is better for the any system
• Corrective actions.